prefer-direct-imports-over-module-mocks

prefer-direct-imports-over-module-mocks is a cursor rule for Cursor from prisma/orm. It costs 0 tokens per session (1,465 once invoked), scanned A, original, Apache-2.0.

A testing design rule for extracting a directly importable core instead of relying on Vitest module mocks and module resets. It applies when configuration, environment variables, time, or shared singletons make production code hard to test.

In plain words
What is it for?
Use it when tests need vi.mock, vi.hoisted, vi.resetModules, vi.setConfig, or dynamic imports just to reach ordinary logic. Refactor the code so the part being tested can be imported directly.
Why use it?
Heavy mocking can hide entanglement in the production code and make tests slow or fragile. Separating the core logic lets tests exercise it without rebuilding module state.

Cursor rule for Cursor ✓ vendor

Written for Cursor: a Cursor rule (.mdc). Also seen: installed under .agents/ (shared by several agents).

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is vi.mock('../../src/config-loader', () => ({.

Good fit Use it when tests need vi.mock, vi.hoisted, vi.resetModules, vi.setConfig, or dynamic imports just to reach ordinary logic. Refactor the code so the part being tested can be imported directly.

Compare 6 cursor rules from other repositories ↓
About the project

Prisma ORM is a Node.js and TypeScript database toolkit that lets applications work with databases through a programming interface instead of writing every query directly in SQL. Developers use it with databases including PostgreSQL, MySQL, MariaDB, SQL Server, SQLite, MongoDB, and CockroachDB. The catalogue add-ons provide agent rules, skills, hooks, agents, and other workflows for using Prisma.

prisma/orm · 47,693 stars · on GitHub · prisma.io

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/prisma/orm
agentmods
npx agentmods add rules/prisma/orm/prefer-direct-imports-over-module-mocks

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for prefer-direct-imports-over-module-mocks

README.md
[![agentmods](https://agentmods.dev/badge/rules/prisma/orm/prefer-direct-imports-over-module-mocks/github.svg)](https://agentmods.dev/rules/prisma/orm/prefer-direct-imports-over-module-mocks)
Your own site
<a href="https://agentmods.dev/rules/prisma/orm/prefer-direct-imports-over-module-mocks"><img src="https://agentmods.dev/badge/rules/prisma/orm/prefer-direct-imports-over-module-mocks/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for prefer-direct-imports-over-module-mocks

Your own site · 80×15
<a href="https://agentmods.dev/rules/prisma/orm/prefer-direct-imports-over-module-mocks"><img src="https://agentmods.dev/badge/rules/prisma/orm/prefer-direct-imports-over-module-mocks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,465 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.01465
Opus 5.5 $0.00000 $0.00586
Sonnet 5.5 $0.00000 $0.00293
Haiku 4.5 $0.00000 $0.00146

Measured 1mo ago against content hash a8fc6ddd4b53, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

prefer-direct-imports-over-module-mocks scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.agents/rules/prefer-direct-imports-over-module-mocks.mdc · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Prefer direct unit imports over module mocks in tests

When you reach for vi.mock / vi.hoisted / vi.resetModules / vi.setConfig to make a piece of production code testable, stop and ask: can the production code be factored so the test imports the unit it cares about directly?

The usual symptoms that you're about to write the wrong shape:

  • A test file with vi.mock('../../src/some-helper') because the unit under test calls some-helper as a side effect.
  • A test file with vi.resetModules() in beforeEach to force re-evaluation of a module whose state leaks across tests.
  • A test file with vi.setConfig({ testTimeout, hookTimeout }) at module scope because cold-importing the unit on every test is too slow.
  • A test file with await import('…') inside a helper "so the mock is wired before module evaluation" — vi.mock is hoisted by vitest; a top-level static import sees the mock just fine. This pattern is almost always a misconception.

These are all signals that the production code has an entanglement (typically: config loading, environment access, time, or a stateful singleton) that's making the testable core hard to reach.

The fix

Extract a pure-ish core from the entangled wrapper:

  • Pure-ish core function — takes the resolved inputs directly (e.g. { migrationsDir, spaceFilter }, not await loadConfig()), returns a result object or throws structured errors. No side effects beyond what the test's tmpdir or fixture owns.
  • Thin wrapper — the CLI command builder / HTTP handler / scheduler hook — calls the entanglement (loadConfig, process.env, Date.now(), the singleton getter), resolves inputs, delegates to the core. One screen of code, no branching.

Tests import the core directly. Zero vi.* plumbing. If the wrapper is genuinely just resolve-inputs-and-call-core, you can skip wrapper tests entirely — the build closes the gap.

When module mocks are legitimately the right tool

Some entanglements can't be cleanly extracted:

Read the full file on GitHub · 101 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 101 lines · 0 tokens per session scan A a8fc6ddd4b53

Subscribe to this mod's changes

prefer-direct-imports-over-module-mocks is a cursor rule published in the GitHub repository prisma/orm (47,693 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,465 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.